Siren



FIG. 1 is a top plan view of a siren showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view taken from the left of FIG. 1;

FIG. 5 is a side elevational view taken from the right of FIG. 1;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top and front perspective view thereof; and

FIG. 8 is a bottom and rear perspective view thereof. 

The ornamental design for a siren, as shown and described. 